How would you prove that angle 1 = angle 4

Landon wrote that 3−2.6=4. which statement about his answer is true?

Martha is training for a duathlon, which includes biking and running. she knows that yesterday she covered a total distance of over 55.5 miles in more than than 4.5 hours of training. martha runs at a speed of 6 mph and bikes at a rate of 15.5 mph.

What is the measure of angle a and angle c ?